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‘‘‘help please!!! my iphon fell to water ,i open it up,clean all the parts with alcohol , now the iphone still not work ,but the vibrat buttom working and i can connect the iphone to computer. what can i do????

Most likely the screen has gone bad from the water damage and the battery seems to be okay luckily. But I’d replace the battery as well since the phone has been water damaged. TL:DR - Front Display assembly and battery probably needs to be replaced. It’s worth a try as the phone is still showing signs of life. You can get the screen from here: iPhone 4 (GSM/AT&T) Screen You can get the battery from here: iPhone 4 Battery Replacement guide for screen: iPhone 4 (GSM/AT&T) Screen Replacement Replacement guide for battery: iPhone 4 Battery Replacement